I read it on DU so it must be true.
It wasn't just DU that ran with the "Bush and the CIA killed Kennedy" conspiracy. I remember seeing it on book tv and lots of websites that were featuring the Alex Jones video that supposedly had proof.
The History Channel ran a segment in November of 2004 called "The Kennedy Assassination: Beyond Conspiracy" which basically concluded that Lee Harvey Oswald was the lone gunman. That debunked the theories and alleged proof that there were more gunmen involved. It was interesting how they revealed Oswald as a fan of communists and even saying he wanted to hijack a plane to go to Cuba. They also revealed that Lyndon Johnson went to his grave believing that Cuba was behind JFK's assassination and he didn't want to say that because he didn't want to confront a possible miliary action.
As far as I'm concerned, JFK was probably the last of the real moderate Democrats that they'll let run for president. He even appointed one of the original Roe v. Wade dissenters (Byron White) to the Supreme Court.
Rush Limbaugh even played a tape of a JFK speech about how tax cuts would stimulate the economy and Limbaugh proclaimed JFK a "dittohead". (I didn't hear the show, but I read it at National Review)
http://www.nationalreview.com/flashback/flashback-bowman080103.asp